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Stacking sequence in face centered cubic (FCC) close packed structure is?

The stacking sequence in a face-centered cubic (FCC) close-packed structure is ABCABC.

  • In the FCC structure, close-packed planes are of the form (111).
  • When parallel (111) planes are stacked, atoms in plane B fit over valleys in plane A and atoms in plane C fit over valleys in both planes A and B.
  • The fourth plane fits directly over atoms in plane A.
  • Consequently, a stacking sequence... ABCABCABC. ..is produced using the (111) plane.